//package opencv.features2D.feature_description;
//
//import org.opencv.core.Core;
//import org.opencv.core.Mat;
//import org.opencv.core.MatOfDMatch;
//import org.opencv.core.MatOfKeyPoint;
//import org.opencv.features2d.DescriptorMatcher;
//import org.opencv.features2d.Features2d;
//import org.opencv.highgui.HighGui;
//import org.opencv.imgcodecs.Imgcodecs;
//import org.opencv.xfeatures2d.SURF;
//
//class SURFMatching {
//    public void run(String[] args) {
//        String filename1 = args.length > 1 ? args[0] : "../data/box.png";
//        String filename2 = args.length > 1 ? args[1] : "../data/box_in_scene.png";
//        Mat img1 = Imgcodecs.imread(filename1, Imgcodecs.IMREAD_GRAYSCALE);
//        Mat img2 = Imgcodecs.imread(filename2, Imgcodecs.IMREAD_GRAYSCALE);
//        if (img1.empty() || img2.empty()) {
//            System.err.println("Cannot read images!");
//            System.exit(0);
//        }
//
//        //-- Step 1: Detect the keypoints using SURF Detector, compute the descriptors
//        double hessianThreshold = 400;
//        int nOctaves = 4, nOctaveLayers = 3;
//        boolean extended = false, upright = false;
//        SURF detector = SURF.create(hessianThreshold, nOctaves, nOctaveLayers, extended, upright);
//        MatOfKeyPoint keypoints1 = new MatOfKeyPoint(), keypoints2 = new MatOfKeyPoint();
//        Mat descriptors1 = new Mat(), descriptors2 = new Mat();
//        detector.detectAndCompute(img1, new Mat(), keypoints1, descriptors1);
//        detector.detectAndCompute(img2, new Mat(), keypoints2, descriptors2);
//
//        //-- Step 2: Matching descriptor vectors with a brute force matcher
//        // Since SURF is a floating-point descriptor NORM_L2 is used
//        DescriptorMatcher matcher = DescriptorMatcher.create(DescriptorMatcher.BRUTEFORCE);
//        MatOfDMatch matches = new MatOfDMatch();
//        matcher.match(descriptors1, descriptors2, matches);
//
//        //-- Draw matches
//        Mat imgMatches = new Mat();
//        Features2d.drawMatches(img1, keypoints1, img2, keypoints2, matches, imgMatches);
//
//        HighGui.imshow("Matches", imgMatches);
//        HighGui.waitKey(0);
//
//        System.exit(0);
//    }
//}
//
//public class SURFMatchingDemo {
//    public static void main(String[] args) {
//        // Load the native OpenCV library
//        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
//
//        new SURFMatching().run(args);
//    }
//}
